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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13594e9b894a520481f0ae5a9fdd8db126e32c46866a2f6f573d05a393563b39' 
  AND token = 'sDog36RKEAHs2ZqSStIewkapsVDFy9QMxUtrs2sAWXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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