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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f655e827f0de89a7ebf3ceb800f0cef792ab6b42dd2b6d0b85203df5e4d9886a' 
  AND token = 'c/b2OCCALYgM+7/KjO2m9Ef+K6vWzifs09Lyt75dsys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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