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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d493410701e744b7b812eb18a35fa3fff7b3766164df85a308643fb8caaabcc' 
  AND token = 'ScuhgyXwEvpNB6roVtKXLMKDd1m2qPmwuSmQ5TxqMUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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