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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b2408a2c4e504be041f687d69f8ec22758e8a48ee956312d9a7c9aa20e8a17' 
  AND token = 'ET4GIRAz3aTZOyXKlDBTEd2lHy+gYraRand8lafFi+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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