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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d2096efa2ee694b3f4214a71d16dd90d5d9c843f1283b32b1be95d1961e22c' 
  AND token = '4kBePSVklkPjWk36Mp8FaUUYqJDjw2C3oDMvmfA3iOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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