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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192baf58882a8162cd3437727d4b4e49cf0a6da9b127d691ce4dce3d73ee82b4' 
  AND token = '/VmEDDmKR3NGldLGxE5QS2IEQ7rquA0HgCSRx38ayos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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