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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0914548fce16ea617fa608e20c7c72a98f260fe0891d48d82377f30125438761' 
  AND token = '/aNDwXr8d2SzYQapMfxEbhJtesEprjVs6zeJn0BAa88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}