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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13726dedd1ca0f5da0ee1a7fb05d37bc55ec212cc13fbfcbf1e2034cfa92060' 
  AND token = 'Kj1Hmthl7ldq6ELl5lpnTl4A29QqY+sVnVLq78K44FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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