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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6290ed49bc3c8380fc536694377c09d29ee136b536b30dd796cf353887b376' 
  AND token = 'tJPxiHhpgsUPSj8z39uCbeOGgG3gUr+q1Uq1Juzm0qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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