SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffac48221e623211c83e901c2712b73b1569b4e041e2f1c9b85efbf9cd5a710' 
  AND token = 'qm8pqOw1YgvEOv76+yC5hJ+oxroBaXpoOMzkBUZvQb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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