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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a605822129d29f9aa08374fb53e0e6496a4ff1418248a5f55b9046292699e967' 
  AND token = 'OnjHaZ2vJpa84BTQB6422vZy7ZJpG41nB9KGonuoV3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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