Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd556244abf57dee1e6dacc82eedc89c5ffff598b400d501bfa556a3258ca3f9' 
  AND token = 'QlTwDiq1+cfCcItOLuLSBn1h2tC8ZaqX5dVdU1P6KU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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