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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5744d378255bc6955f2f109f51adb5c24afaa29ac0d7fd192289ed68ac02e8f9' 
  AND token = 'nef+8A8xXCgetSis2DGVXqqlI8iIAEc/gEjiSGA00BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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