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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2ebf5d7a8220a030e1620c1b7d34b27bf4272a8f9a8f56603423fc94ad4848' 
  AND token = 'J8d47NZ48MhFAP6bVqi0zyt9Z4MQI0K522QIUL4bNUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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