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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf32f4972dab1238e71b72a8228b787192888b41ed07f9c998c555304fd0809' 
  AND token = 'vroMI4m1N5z4WbGWDhH+9BeH57cP9ZxTRrMxRRzTe0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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