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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c77ded181b734bc37373bcaaa90fd6ed175986bc92cbed31fd71f7b3fae31f' 
  AND token = 'UbsbqEd6gjsHrNbKiiVr007MdraAOEXJdZ0TPhTW4PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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