SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e56b3814fe972d9b35f1195e7f95e66f546e1c3d0425072317d463cbeb6705b' 
  AND token = 'YvuqhWcmXzeRFINbc87yMoevBwgZ/jdyoyNvXQJvEq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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