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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b991114def3bf71bbcf7fba149def3c57290904454fcdea0c0c730637c8fb0' 
  AND token = 'EGv61xy6xdaYIQBOHYeJUp8kCkuYwoAj/brUZo7BQ9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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