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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5354dd7bb04fc0efc2f8e9a9ef193a7d5e066c1de31f2b6c0f3211bc22dbe5' 
  AND token = '88O8peXd/hARF2CzOfNy3D4znNEKRBaJl52jYsKOapM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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