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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc2c6ae68c2f26425613e20bc9f2261598f89ce097ab43ac01193cdd034e0e6' 
  AND token = 'Xl2tKO+LvZ3xz6KBfT5ys5jKovIh6khq7gOpxo9oLzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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