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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3880554e2001ca17e4d5455fbdc818d2e5e0825a51f4049cb189744836e1f3c8' 
  AND token = 'HG9YmOMew7CLuEwMu18nv084FD7XWXSOUISkd9D8osA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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