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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cea69cb553f030bc3c2f7f226e5bc556ab95b8c64af31d3903c4379f88327d' 
  AND token = 'qtgA36LVXw852AkH2tznBImwUPEvUH3hbh3CLiwIejU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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