SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaba3fd866f324d751eeb28434b8c134b6c27701957c2935e077b4344ff0a685' 
  AND token = 'XMXkm6+pwvxN/SS20vGL06sIcjpPnrlmWUn3VTJIzT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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