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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '104b8d5471554a2689a5d0eeec2db11ec884e499c258fac57d7233a43acca7bb' 
  AND token = 'vpSrYU2XC0bCuLI4rU3NNhHFuXKFEgWBTcUOr0ufVa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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