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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829e2f11ee905f3ef4798a2604a29a7ec57ae840d161a56565100365b0d64c27' 
  AND token = 'NZo90GhE5hIWiJZxC82w/5zK589aU9lkyDk6817IdMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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