SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befe356b279e37f89bb9d4de1a2a23513a75365c2676fcc9db14e98be0b92484' 
  AND token = 'A9E+I5XhCZPQ/d6C71EvsJ2lvYGGahjAZOeHrQzqPdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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