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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a3c6eac477e54a8a82ab1a7b16545831cf6838bb0c858091cfb9ac638cd2a99' 
  AND token = 'MlHoH0TmvanZY+xbqB7nkyHv7iPwTonrfqIX6sayifI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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