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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1776115e6a52f027b7f292f1d15094c7a420d24a444e98efa4c4201ef96ca4' 
  AND token = '2zyRFlYsZnh1x3HYO7L9X+WC5/0uUHy1cZyE6AhbeIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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