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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e40883a59b7e5d5539782f4143a84c911cc28875e2e9ce3be6ab3a03e5029c' 
  AND token = 'kzOlg46USSxOvdZ5UmQncj0LSz4JAH5Cu6fOq+0XvtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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