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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdeea57cea04932a172ddf6d296f78e30558987c5f5afe8baf2d958fd7313faf' 
  AND token = 'qeEDBaFUUXlqIjajOlbyVaBgVo2bRDK7GwwPDxpU5QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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