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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abb7ced82f499f2c33b64652f1b1169ea1c18bc1c528f26a695967d131f8432' 
  AND token = 'LgQ3hO9855hFEBR82n9+KEXdpGDX8Kg/gQQ2PpChg5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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