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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8915d7c99aec3f37333cdb54c8671ad050edf7a2f71128c9299fc222a6dc88' 
  AND token = '9qNRjPl+tVXcHu92ckz8FJxWUBNN+aYMUDLJQwe80HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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