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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfea314976624a251fdfba7297a9b61e9555bcc53e187720e215735cbafc9978' 
  AND token = 'QJyJZHsxa2jzdms0cjYLZzfz7SWg0eNtipDe2879xCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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