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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2254cc357742efcc1105709c977d13f6f1eaa480508b977cfb40b9cec5c050c' 
  AND token = 'bsjUF5uyzZSZB+RolP5dXQO2k5bKnk1GYMPrqDG8zxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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