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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30385bf862152c49a71410fc405fce1fd400367f76014a3f027b23d0333a7588' 
  AND token = 'QNvMUkYlBuGsFQOVC57xjporuoQe9fsNcHJ2RYiwcBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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