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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f1cb44cd4b731902e595beddab3234440213bcc904467cb4681a77d27efc45' 
  AND token = 'a4L2ZkM92ih7qOCaZEsz7V2lufllHg2hOJ8bbxeY2I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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