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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a184cf744ecd247436f079f60fb43e4d930e1e5e96bb3ca78ab8a064e5494a0' 
  AND token = 'DZD9ps7PF7ZuCbDuF0J+ceskFwCgbjj8bk1nAXu5p9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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