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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f7c6d304df92d8a3dc419c89e76513065eeb2654db7bb14b970bdc6653af65' 
  AND token = 'LHd5bx6P0zZN2WlWkp9m6ydtwNVbTaVQY4M3Wkh4Q/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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