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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0957f23d25732f2589b5b5cdd82dfd2fa428f56b5b0c3bb91a7a466bac8c7849' 
  AND token = 'Mu4eq7GctDdH3ruRink9P9qrWJCh69WBpduDTYvaNfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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