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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670fb4527c160ad0d1b9295387b33c0e2972d766c4003939f8e94c864a716c1b' 
  AND token = 'OdOlYaSahTpXqK6Vz7pACfDPUaXH7q42Eg6qmH5UsvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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