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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277744a2b25d8c8dcd62253946dc2519fc44482527c2467f3462e26d0fa3f484' 
  AND token = '6zPcRvbpOxxqcc/5MINctW21WbUc46tSfM9VMBKO3WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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