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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39086f59ba689cc6aea950fc327499f612903b500abb1d5b9ece81afa37c899' 
  AND token = 'fEeFlONB3afNiPVc4nVlvx9Jm2ylGW8Xs3pf91yWlR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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