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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '607c1804179cb41ca12f8e3689b4491f2417d47fccee399a573a95e7d0e1e9de' 
  AND token = '7h/fIw4BTskvVjrvRQwRe0FmpcCiwJxf4ft5hwwbiHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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