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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0f8b3a83f6a4e78bb90b5c82bf427efeec7bb3fbebf71053b6c4eb1fe594a9' 
  AND token = 'nHhivpYnF4rUqDf6UM8Urdn1CkiS7uV4Dn6EIMYi0rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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