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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682d561bdd0006098cf9da3360aad85accdf8f81ab16f97207295192b53bc982' 
  AND token = 'WI+aRFaoMvwfzShl5EH11Zvn2jBTWUiULc6PtEP4zqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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