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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112b16068dcf280941150e144e4cb4e64d358878cc2e0f9db0e59aa859612016' 
  AND token = 'kcrLadsJa24PqpEKujyh9ZyWAbxi7eC7CO8dhuSkYGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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