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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0a804c0756659c5e386cb0d5120eb39aa98cf49d4ef18e6156934e070ce0cb' 
  AND token = 'vY31ByJPvnmk9U9Q44tCHjrwYuc/sjuTa/w+HqUUYvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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