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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9565675bfbf9ee49d6490038c3db050ac3c1271d8bad10b5769e2adb450dc2e6' 
  AND token = '8V4NcyGxKAWcPywVIVE+qKhF7agREo86baK4j0+g8gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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