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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c685b74a4d3aa05b2034f59e5696f18ab458c5bbd8f64ec9bbf44915ce34444' 
  AND token = 'vjfhmj45GFJFEOICz5pf5V6dsFSTapT/d36zGOWqmDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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