SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112bf5a970886bf9b078128f429b29f56f209e37dbe218ccf20d356636cc7f80' 
  AND token = 'Fm6A/dWLeXy9kYYNlcEoZO8JO5pyprPNkClXw0Wchg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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