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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12481683b85e17a8908e54eb7248f14aa9b5831214d055141962287e3d24edfd' 
  AND token = '1lB0CZLJmvd0aYkIf8Zod9htoZCVpRxSvVT+Z5YstWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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