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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ffd6bbd5692f208fe3e3fc146f9d3949d52053fa98400a983343ca1b5ca057' 
  AND token = 'Wf5+j0cPrM1lvSt+fKhjc+7mINlBpXPxgzGk+D2Wpw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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