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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7f4addf6a690f18e2f0ec7608c085aea87450b427667fa644869faa1c67115' 
  AND token = '8gS8IwHtEA4HKhuzkHEgCMNxP5b6wC8mAd2L8GTPqFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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