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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a2fa9b91494b9367f52d32fd731f7030726e03bf04dbc692e8c015f7c5375d' 
  AND token = 'O0SuXPEotXndjkoyDCrFA7IYpP4EuthfNgGIVn2him8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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