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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a331687f07c84fab8657ec170be30bd8e96f7ce461f2ade6ca256f8afed0d0d1' 
  AND token = 'Mr5d1ORvcH6EZBee9Gs69M03V9p2/2gmMeI+g7fflM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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