Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a86a92b6fbc079adcce2a21ea9e37cc7358b00359c2c2121913e513d52d373a' 
  AND token = 'c4jRRhV4OSNGk7jxKSc6vGBtqlOTY0pRidjv8GOGVEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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