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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67475ea8d0a4ecd433fc7913f679ad8186c20686f222789c3968dba546b82e4a' 
  AND token = '5gCCf0Oza54em0irPd7GO0JDw1gPHvIo7twMyZGi59U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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