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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5937700a7be8c88d21b8c62e626ae3d7a6ea1f8ba6c51ec0ee9e747fd9579e' 
  AND token = 'jfAzPykead96aee64Tz2MFgiJXkQsAtOFQLiFx2bBrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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