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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f344e369dc3b8e424f40efb33ba1e5c325be9bf92949472632627717f80dde' 
  AND token = '9m3xbseDFIEv0i1W59fmp/omNJbMI14sJj0BlnPzQBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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