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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bd25a3d1ee0e88bf72c0304a038d1db0870234a45c9df6dcbf343b6d7b7236' 
  AND token = 'ltD6Bd5ViJsHutvzUcyXbDTXufRbTWpW81nBc8hb5GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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